CVE-2021-20564Network attack vector

Information disclosure via missing HSTS enforcement

Published May 14, 2021 · Updated Sep 16, 2024

Information disclosure in IBM Cloud Pak for Security 1.4.0.0 through 1.6.0.1 allows remote attackers to intercept sensitive data. Affected HTTPS responses omit Strict-Transport-Security enforcement, allowing browsers to accept connections without the required transport policy. A man-in-the-middle position is required, and the documented consequence is interception of sensitive information rather than modification or service interruption.

CVSS severity5.9
Medium
EPSS probability0.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Information disclosure in IBM Cloud Pak for Security 1.4.0.0 through 1.6.0.1 allows remote attackers to intercept sensitive data. Affected HTTPS responses omit Strict-Transport-Security enforcement, allowing browsers to accept connections without the required transport policy. A man-in-the-middle position is required, and the documented consequence is interception of sensitive information rather than modification or service interruption.

The record

CVE
CVE-2021-20564
Published
May 14, 2021
Updated
Sep 16, 2024
Vendor
IBM
Product
IBM Cloud Pak for Security
Classifications
CWE-319, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 14, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.4.0.0
  2. Affected versionversion=1.5.0.0
  3. Affected versionversion=1.5.0.1
  4. Affected versionversion=1.6.0.0
  5. Affected versionversion=1.6.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · IBM Cloud Pak for Securityversion=1.4.0.0; version=1.5.0.0; version=1.5.0.1; version=1.6.0.0; version=1.6.0.1

Published CVSS scores

5.9NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
5.9IBMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-319Cleartext Transmission of Sensitive Information
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo